Could try looking in the relevant fixed thread in section above and/or asking there... The directions didn't seem that difficult to follow when I installed on half a dozen Sonys but I guess that depends on mindset and/or equipment/software of user... it also might be better to remove the SD card before doing the flashing - you are attaching your 600 to the computer and have checked that it is seeing the 600 attached... should show as mounted drives (like memory sticks or SD cards)...

And as for a number to call - you had noticed that this stuff is FREE, it's done by people because they want to do it for themselves and thought others might also like it... it isn't a paid company producing paid for software!!!